In radiation the rays used are –
**Core Concept**
Radiation therapy is a treatment modality that uses ionizing radiation to kill or control malignant cells. The type of radiation used can be either electromagnetic (X-rays and gamma rays) or particulate (alpha, beta, and electron beams).
**Why the Correct Answer is Right**
The correct answer is X-rays, which are a type of electromagnetic radiation used in radiation therapy to treat various types of cancer. X-rays are produced by accelerating electrons in a high-energy beam, which then collide with a metal target, producing X-rays. These X-rays can penetrate tissues and cause damage to DNA, ultimately leading to cell death.
**Why Each Wrong Option is Incorrect**
**Option A:** Alpha particles are high-energy helium nuclei that are not commonly used in radiation therapy due to their short range and high ionization density, which can cause damage to surrounding healthy tissues.
**Option B:** Beta particles are high-energy electrons that are sometimes used in radiation therapy, but they are not the most common type of radiation used.
**Option C:** Electron beams are a type of particulate radiation used in radiation therapy, but they are typically used for superficial lesions rather than deep-seated tumors.
**Clinical Pearl / High-Yield Fact**
When choosing radiation therapy, the type of radiation used depends on the location and depth of the tumor, as well as the desired dose distribution.
**Correct Answer:** C. Electron beams